Holder-up for riveting



3, K BUTTER HOLDER-UP FOR RIVETING Original Filed Oct. 14. 1958 ,se M1 ZF l Patented June 3, 1941 2,244,047 HOLDER-UP Fon RIvE'riNG Karl Butter, Rostock, Germany, assignor to Ernst Heinkel, Warnemunde, Germany Original application October 14, 1938, Serial No.

235,043. Divided and this application Febru ary 9, 1940, Serial No. 318.1165. In Germany August 29, 1938 l1() Claims.

The present invention relates to an improved holder-up for use in riveting.

It is an object of the invention to provide a holder-up for use in riveting operations wherein the materiall to be riveted is perforated by the shanks of the rivets.

It is found that in such operations the punchy ings struck from the work may stick to the shank of the rivet and interfere with the performance of subsequent operations, for instance the formation of a closure head on the rivet. This difficulty may, for instance, be encountered when riveting imperforate sheets by means of a machine as disclosed in my co-pending application, Serial No. 235,043, Patent No. 2,215,388, of which the present application is a divisional.

It is accordingly a further object of the invention to` provide an improved holder-up for use in riveting machines for riveting imperforate sheets which are to be perforated by the shank of the rivet.

It is a further object of the invention to prolvide a holder-up having means for receiving punchings from the work and resiliently gripping them.

My invention also includes Within its scope riveting machines incorporating my improved holder-up.

In order that my invention may be well understood, an embodiment thereof will now be described by way of example, with reference to the accompanying drawing, as incorporated in a riveting machine of the kind disclosed in my aforesaid co-pending application.

In the drawing,

Figure 1 is a sectional elevation of a riveting machine constructed in accordance with the invention of my said co-pending application, and l embodying one form of holder-up according tothe present invention,

Figure 2 is a sectionalelevation of part of the machine, taken at right angles to Figure 1, and

Figure 3 is a sectional view of part of the machine on a larger scale, showing the holder-up in detail. v,

Referring to the drawing, the riveting machine comprises an upper part I and a lower part 2 between which parts imperforate workpieces 3 and 4 are placed on a hollow rest 5 of the lower part 2. Arranged in the upper part I is a stamp 6 reciprocable vertically by any suitable means and partly surrounded by a slidable sleeve 1 cooperating with a coil spring 8 which tends to move the sleeve against a cap nut 9 screwed to a pipe I which surrounds the stamp B. To the upper part I of the machine is fastened an arm II carrying an interchangeable ring I2 for the reception of the rivets, which may be fed by hand or automatically. The ring I2 is arranged in such a way as to allow of a slight downward movement when the stamp 6, during its down-` ward stroke, presses the sleeve 1 on to the ring I2 which, therefore, is pressed on to the workpiece 3 before the stamp 6 reaches the rivet I3 (Figure 3) to be struck through the sheets 3 and 4. In the working head of the lower part 2 of the machine there is arranged a slide I4 carrying two different tools and reciprocable through the intermediary of a lever I5 driven by a crank guide drive, part of which is illustrated at I5. One tool comprises a snap head die I9 mounted in the slide I4 and subject to the action of a spring 20 which tends to hold the die in such a position as not to project above the surface of the slide I4.

The second tool carried by the slide I4 con-h sists of the holder-up illustrated in detail in Figure 3. This holder-up comprises a. main part IS having a narrowed upper portion ll'which at its upper end is slotted longitudinally to provide three resilient fingers Ila. A sleeve |60. surrounds the portion Il and has screw-threaded engagement therewith at 25, the sleeve IBa having a countersunk upper surface 24. A spring I8, co-operating with a ange V2li on the part I6, tends to maintain the holder-up in such a position as not to project above the upper surface of the slide I4.

The holder-up and the snap-head die I9 are brought into working position by means of a spring-pressed spindle 2| connected to a piston 22 movable up and down in the head of the lower part 2 of the machine by means of an eccentric 23 driven in any suitable manner.

The movements of the slide I4 and piston 22 are so timed that the piston is lifted as soon as the axis of one or other of the two tools carried by the slide I4 reaches the vertical axis of the hollow rest 5 and of'the stamp 6. The lifted spindle then strikes the lower surface of the tool and lifts the latter until it reaches the shank of the rivet I3 struck through the workpieces by the stamp 6.

The operation of the machine is as follows:

The workpieces 2 and 3 to be riveted are put on the rest 5, and a countersunk rivet is fed to the movable ring I2. The slide I4 is moved into the position in which the holder-up and the bore of the rest 5 are in alignment. The piston 22 is then lifted so that the spindle 2I strikes the lower surface of the holder-up and lifts the latter into the rest 5 against the action of the spring I8 until the upper countersunk surface 24 reaches the work. In the meantime the stamp 6 has started its downward stroke so that the sliding sleeve I presses down the ring I2 to press the workpieces `on to the holder-up IB and the rest 5. In continuing itsm stroke the stamp 6 strikes the head of the rivetl I3 and strikes the shank of the rivet through the workpieces, pressing the edges of the rivet hole into the countersink 24. The punchings 2'I are pushed by the rivet shank into the resilient chuck. formed by the resilient fingers lla.

The spindle 2,! is then lowered to allow the holder-up to be Withdrawn under the actionof the spring I8, carrying with it the punchings 2I, and the slide I4 is then moved into its other Working position, whereupon the plunger 2I is A again raised to lift the snap head die!,9 to .set' tithe losure'head of the rivet. The plunger 2I is then lowered, permitting the spring v2l) to With- The holder-up thus positively removes`\the "punchings from the shanks of the rivets and prevents the trouble which might otherwise be experienced due to punchings' sticking to the rivet shanks and interfering with the operation of the snap-head die.

It, is to be understood that although I have described my invention as incorporated in a particular riveting machine, no limitation is thereby implied as to the scope of my invention.

I claim:

1. In or for a machine for riveting imperforate sheets to be perforated by the shanks of the rivets, a bored holder-up having disposed therein and at the work-engaging end a bored resilient chuck for l receiving punchings from the work and resiliently gripping them.

2. A holder-up for riveting, comprising a bored member having a narrowed end of reduced bore, slots in said end to provide a resilient chuck, and a sleeve enclosing said narrowed end and having a countersunk work-engaging and.

3. A holder-up for riveting, comprising a tubular member having an end of reduced bore, said end being slotted to provide resilient -gripping ngers and a sleeve having screw-threaded engagement with said member and enclosing said slotted end'thereof. v

4. In a riveting machine a reciprocable stamp, a slide, a snap head die carried by said slide, Ga holder-up carried by said slide, means for reciproeating said'slide whereby to bring said die and holder-up alternately into opposed relation to said stamp, and means in said holder-up for receiving and resiliently gripping punchings from the work.

5. A riveting machine comprising, in combination, a reciprocable stamp operative to strike a rivet through. the Work to be riveted, an apertured work support, a slide reciprocable with reference Atoxsaid'ork support, a holder-up and a snaphead die carried by said slide, means for reciprocating said slide to bring said holder-up -and die alternately into alignment with the aperture of said Work support, means normally maintaining said holder-up and die in retracted positions,

rnea'nsior advancing said holder-up and die into the apertureof saidworkqsupport whenone or other is in alignment therewithfand means in said holder-up for receiving and resilientlyijgripping punchings from the work.

6. A holder-up for riveting comprising a flanged tubular body part, a further tubular part of reducedinternal diameter, coaxial and co-extensive with said body part, said further part having 1ongitudinal slots, and a sleeve having screw-threadgripped.

9, In or for a machine for riveting imperforate sheets to be perforated by the shanks of the rivets, a holder-up having a through bore for the passage of punchings from the work and including means to resiliently grip punchings received in said bore.

l0. In or for a machine for riveting imperforate sheets to be perforated by the shanks of the rivets, a holder-up having a through bore for the pas# sage of punchings from the work, and a chuck operatively disposed in said bore forresiliently gripping punchings received therein.

KARL BUTTER. 

